Case 1b) is standard notation in most cases. Exceptions which should not be prolonged are for example string staves with very many tied notes or guitar staves where the legato slur might be mixed up with a hammer-on/pull-off slur.
These exceptions are deactivated by default.
Notes tied over many measures or with many ties should not be prolonged either. The default maximum span is three measures or three ties (Option: "Only If Tied Measure Span and Number of Ties is Less or Equal than X Measures").

The plug-in removes 'open' ties (i.e. ties not connected to an end notes, also called 'l.v.' ties) by default unless they belong to an instrument that actually can play 'l.v.' (e.g. harp, cymbals, glockenspiel, etc.).
Image 2a (Left): Original; 2b (Right): Open Tie Removed

Glissandi are aligned horizontally and vertically to not collide with notes, note dots and/or accidentals.
Usually glissandi are note-attached smartshapes or tab slides.
By selecting "Handle Solid Lines as Glissando" or "Handle Dashed Lines As Glissando" it's also possible to use measure-attached smartshapes as glissandi.
As this option is unselected by default, it's not available in the Silver edition.

Note: If selected, the algorithm currently assumes that all solid and/or dashed lines are glissandi. So use with caution.
Otherwise for example dashed crescendo lines might be turned into a vertical glissando line.